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nexus: Minimal IO FASM output

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Signed-off-by: David Shah <dave@ds0.me>
This commit is contained in:
David Shah 2020-01-11 10:20:21 +00:00
parent 689922bc21
commit cef0e1db8f
2 changed files with 28 additions and 0 deletions
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2
nexus/constids.inc
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@ -101,3 +101,5 @@ X(PLC)
X(CIB)
X(CIB_T)
X(CIB_LR)
X(IO_TYPE)

26
nexus/fasm.cc
View File

@ -108,6 +108,12 @@ struct NexusFasmWriter
log_error("No tile of type %s found at location R%dC%d", ctx->nameOf(type), loc / ctx->chip_info->width,
loc % ctx->chip_info->width);
}
const PhysicalTileInfoPOD &tile_at_loc(int loc)
{
auto &ploc = ctx->chip_info->grid[loc];
NPNR_ASSERT(ploc.num_phys_tiles == 1);
return ploc.phys_tiles[0];
}
std::string escape_name(const std::string &name)
{
std::string escaped;
@ -120,6 +126,8 @@ struct NexusFasmWriter
return escaped;
}
void push_tile(int loc, IdString tile_type) { push(tile_name(loc, tile_by_type_and_loc(loc, tile_type))); }
void push_tile(int loc) { push(tile_name(loc, tile_at_loc(loc))); }
void push_belname(BelId bel) { push(ctx->nameOf(ctx->bel_data(bel).name)); }
void write_pip(PipId pip)
{
auto &pd = ctx->pip_data(pip);
@ -178,6 +186,22 @@ struct NexusFasmWriter
write_enum(cell, "GSR");
pop(2);
}
void write_io33(const CellInfo *cell)
{
BelId bel = cell->bel;
push_tile(bel.tile);
push_belname(bel);
const NetInfo *t = get_net_or_empty(cell, id_T);
bool is_input = false, is_output = false;
if (t == nullptr || t->name == ctx->id("$PACKER_VCC_NET")) {
is_input = true;
} else if (t->name == ctx->id("$PACKER_GND_NET")) {
is_output = true;
}
const char *iodir = is_input ? "INPUT" : (is_output ? "OUTPUT" : "BIDIR");
write_bit(stringf("BASE_TYPE.%s_%s", iodir, str_or_default(cell->attrs, id_IO_TYPE, "LVCMOS33").c_str()));
pop(2);
}
void operator()()
{
// Write routing
@ -192,6 +216,8 @@ struct NexusFasmWriter
write_comb(ci);
else if (ci->type == id_OXIDE_FF)
write_ff(ci);
else if (ci->type == id_SEIO33_CORE)
write_io33(ci);
blank();
}
}